From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Requesting the type test report specifies the materials used for gear wheels in the Watford I.S.12 magnetos on engine No.13.
| Identifier | ExFiles\Box 43\4\ Scan164 | |
| Date | 22th April 1929 | |
| X4021 17 Mr. Rowledge, Mr. Platford, Mr. Hives, Mr. Amey A.I.D. April 22nd, 1929. W/HB{C. E. Harcombe}/R 95. WATFORD MAGNETOS ON TYPE TEST ENGINE NO.13. Several materials have been used for the gear wheels in the Watford I.S.12 magnetos. A.I.D. Headquarters have requested that the type test report will state definitely the materials used on the two magnetos fitted to type test engine No.13. (Signature) A.I. For D.A.I. | ||